Heat-generating element cooling device

Abstract

A cooling device mounting a fan unit (3) above a heat sink (2) mounted on a heat-generating element (1) or buried therein, which produces an effective air flow and achieves a uniform cooling action by having the heat sink (2) comprised in various shapes. Further, a cooling fan disposed away from the heat sink (2) or to the side of the same is used for effective cooling through an air conduit passage formed by pipes or a cover.

What is claimed is: 
     
       1. A heat-generating element cooling device comprising: a heat radiator attached to a heat-generating element mounted on a printed circuit board, said heat radiator having a heat sink formed of a material with a good heat conductivity, a plurality of heat-radiating fins and a hollow pipe portion, said pipe portion arranged at a center portion of said heat sink and having small blowing holes in a side wall of said pipe portion; and a blowing device for blowing cooling air to said heat radiator, said cooling air being forcibly introduced from said blowing device through an air passage to said pipe portion of said heat radiator so as to eject said cooling air through said small blowing holes to said heat radiator. 
     
     
       2. A heat-generating element cooling device as set forth in claim 1, further comprising a plurality of heat radiators attached to said printed circuit board, wherein said air passage is provided for introducing said cooling air from said blowing device to pipe portions provided for each of said plurality of heat radiators on said printed circuit board, said air passage comprising a plurality of air conduit pipes and at least a first coupling portion for connecting said air conduit pipes together. 
     
     
       3. A heat-generating element cooling device as set forth in claim 2, wherein said air passage further comprises at least a second coupling portion for connecting said air conduit pipes together, said second coupling portion being mounted on a front board connected to said printed circuit board. 
     
     
       4. A heat-generating element cooling device as set forth in claim 3, wherein each of said pipe portions are arranged on a center line of said heat-generating element and with a suitable distance with a heat-radiating fin base surface of said heat sink and provided with small blowing holes in a bottom wall of each of said pipe portions to eject said cooling air through said small blowing holes to each of said heat radiators. 
     
     
       5. A heat-generating element cooling device as set forth in claim 3, wherein each of said pipe portions is formed with a guide portion for guiding said cooling air which is forcibly introduced from said blowing device through said air passage toward the center of said heat sink. 
     
     
       6. A heat-generating element cooling device as set forth in claim 5, wherein said guide portion is arranged with a suitable distance between a bottom wall of said guide portion and a heat-radiating fin base surface of said heat sink, and provided with small blowing holes in said bottom wall of said guide portion to eject said cooling air through said small blowing holes to each of said heat radiators. 
     
     
       7. A heat-generating element cooling device as set forth in claim 3, wherein said air passage comprises a bellows-type duct of which a path can be flexibly changed, thereby said printed circuit board can be easily inserted or removed upon disconnection of said bellows-type duct from each of said heat radiators mounted on said printed circuit board. 
     
     
       8. A heat-generating element cooling device as set forth in claim 3, further including covering elements mounted to said heat sink which effectively introduce said cooling air to each of said heat radiators from said blowing device so as not to be warmed by the ambient air and so that said cooling air does not flow outside of said covering elements. 
     
     
       9. A heat-generating element cooling device as set forth in claim 1, wherein said pipe portion is arranged on a center line of said heat-generating element and with a suitable distance with a heat-radiating fin base surface of said heat sink and provided with small blowing holes in a bottom wall of said pipe portion to eject said cooling air through said small blowing holes to said heat radiator. 
     
     
       10. A heat-generating element cooling device as set forth in claim 1, wherein said pipe portion is formed with a guide portion for guiding said cooling air which is forcibly introduced from said blowing device through said air passage toward the center of said heat sink. 
     
     
       11. A heat-generating element cooling device as set forth in claim 10, wherein said guide portion is arranged with a suitable distance between a bottom wall of said guide portion and a heat-radiating fin base surface of said heat sink, and provided with small blowing holes in said bottom wall of said guide portion to eject said cooling air through said small blowing holes to said heat radiator. 
     
     
       12. A heat-generating element cooling device as set forth in claim 1, wherein said air passage comprises a bellows-type duct of which a path can be flexibly changed, thereby said printed circuit board can be easily inserted or removed upon disconnection of said bellows-type duct from said heat radiator mounted on said printed circuit board. 
     
     
       13. A heat-generating element cooling device as set forth in claim 1, further including covering elements mounted to said heat sink which effectively introduce said cooling air to said heat radiator from said blowing device so as not to be warmed by the ambient air and so that said cooling air does not flow outside of said covering elements. 
     
     
       14. A heat-generating element cooling device comprising a heat radiator attached to a heat-generating element mounted on a printed circuit board, said heat radiator having a heat sink formed of a material with a good heat conductivity, a plurality of heat-radiating fins and a plurality hollow pipe portions, said pipe portions arranged symmetrically of said heat sink and having small blowing holes in a side wall of said pipe portion; and a blowing device for blowing cooling air to said heat radiator, said cooling air being forcibly introduced from said blowing device through an air passage to said pipe portions of said heat radiator so as to eject said cooling air through said small blowing holes to said heat radiator and the cooling air introduced inside the pipe portions is ejected from the small blowing holes made in said pipe portions. 
     
     
       15. A heat-generating element cooling device as set forth in claim 14, further comprising a plurality of heat radiators attached to said printed circuit board, wherein said air passage is provided for introducing said cooling air from said blowing device to each of said pipe portions provided for each of said plurality of said heat radiators on said printed circuit board, said air passage comprising a plurality of air conduit pipes and at least a first coupling portion for connecting said air conduit pipes together. 
     
     
       16. A heat-generating element cooling device as set forth in claim 15, wherein said air passage further comprises at least a second coupling portion for connecting said air conduit pipes together, said second coupling portion being mounted on a front board connected to said printed circuit board.